Statistics
Standard Deviation
Definition
Measures spread of data from the mean
Formula
s = sqrt(Sum(x - mean)^2 / (n-1))
Worked Example
Sample std dev of 2,4,4,5,7,9 is about 2.14
Measures spread of data from the mean
Sample std dev of 2,4,4,5,7,9 is about 2.14